Boeing has responded to an Indian Air Force Request for Proposal offering the Apache Block III. The Indian Air Force has already conducted field trials for these helicopters in July 2010. The testing has taken place in the Thar Desert in the northwest and will also happen near the Himalayan town of Ladakh in Indian-controlled Kashmir. Those sites represent the extremes the air force could find itself operating in. The Russian helicopter has not yet been cleared for testing in India. While India has not decided about the type of helicopters they will buy, Boeing and the Pentagon are requesting Congress approval in advance of a potential sale to prevent export limitation issues.